更改每个导航上的导航栏背景图像 [英] Change Navigation bar Background image on each navigation

问题描述

我正在开发 iPhone 应用程序.我添加了导航栏背景图片

I am working on iPhone app. I have added Navigation bar Background image

带接口:-

@interface UINavigationBar (backgroundImageWithTitle)

和方法:-

- (void)drawRect:(CGRect)rect

通过这种方法，导航栏背景图片被设置一次.

By this method Navigation bar background images is being set one time.

我想从不同的 .m 文件中调用它，以便在 bar 上分配不同的图像.

I want to call it from different .m files for assigning different images on bar.

如何实现?

提前致谢.

推荐答案

CustomNavigation.h

CustomNavigation.h

    #import <Foundation/Foundation.h>


    @interface UINavigationBar (UINavigationBarCustomDraw){

    }

    @end

CustomNavigation.m

CustomNavigation.m

    @implementation UINavigationBar (UINavigationBarCustomDraw)

    - (void) drawRect:(CGRect)rect {

        [self setTintColor:[UIColor colorWithRed:0.5f
                                           green: 0.5f
                                            blue:0 
                                           alpha:1]];

        if ([self.topItem.title length] > 0) {


            if ([self.topItem.title isEqualToString:@"First"]) {

                [[UIImage imageNamed:@"First.png"] drawInRect:rect];

            }

            else if ([self.topItem.title isEqualToString:@"Second"]) {

                [[UIImage imageNamed:@"Second.png"] drawInRect:rect];                   

            }




            CGRect frame = CGRectMake(0, 0, 320, 44);
            UILabel *label = [[[UILabel alloc] initWithFrame:frame] autorelease];
            [label setBackgroundColor:[UIColor clearColor]];
            label.font = [UIFont boldSystemFontOfSize: 20.0];
            label.shadowColor = [UIColor colorWithWhite:0.0 alpha:1];
            label.textAlignment = UITextAlignmentCenter;
            label.textColor = [UIColor whiteColor];
            label.text = self.topItem.title;
            self.topItem.titleView = label;





        } 


        else {
            [[UIImage imageNamed:@"wood.png"] drawInRect:rect];
            self.topItem.titleView = [[[UIView alloc] init] autorelease];
        }



    }

    @end

如果你想用 First.png 在 FirstViewController 中设置 navigationBar 背景图片 那么

if u want to First.png to set navigationBar background image in FirstViewController then

在你的 FirstViewController.m 中

in ur FirstViewController.m

        -(void) viewWillAppear:(BOOL)animated{

        [super viewWillAppear:animated];



            self.title=@"First";
            [self.navigationController.navigationBar drawRect:CGRectMake(0, 0, 320, 480)];

    }

如果你想通过 Second.png 在 SecondViewController 中设置 navigationBar 背景图片，那么

if u want to Second.png to set navigationBar background image in SecondViewController then

在你的 SecondViewController.m 中

in ur SecondViewController.m

        -(void) viewWillAppear:(BOOL)animated{

        [super viewWillAppear:animated];



            self.title=@"Second";
            [self.navigationController.navigationBar drawRect:CGRectMake(0, 0, 320, 480)];

    }

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